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Author Topic: Effects of a Camshaft Too Advanced - Ranger 2.3L Case  (Read 12019 times)
El Hombre
Big Block
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Posts: 22510

Location: Puerto Rico
Miracles?.... by appointment only!

« on: May 23, 2014, 04:23:13 pm »

    During the time I've been earning my "bread and butter" in the automotive diagnostics/repair world, I've had the chance to gather a good database of "WTF?" cases. The following was a 1996 Mazda B2300 (aka Ford Ranger w/2.3L 8-spark plugs engine) that went trough two shops previous to mine. The following is a description of the problem/symptom that even though it was on a I4 2.3L engine, does carry a lot of hints or "telltale" signs for any type of engine regardless of its application (DD, Street & Strip, Racing).

  • 1996 Mazda B2300 P/Up with 2.3L engine

Symptoms and Test Results:
  • Gross lack of power. It required the gas pedal to be held to the floor just to move/climb the entrance to the shop.
  • Idle control was intermittent.
  • Only OBD-II failure code showing was P0300 (Multiple/Random Cylinders Misfire) with misfire count above 10k engine idling for each cylinder.
  • Spark Advance, Long Term and Short Term values were withing acceptable range and did not show anything out of the ordinary.
  • ECT, IAT and MAF voltage values were also within range.
  • Injectors pulse width was within specification as well.
  • Fuel pressure was within its 30-45 psi spec.
  • Engine under WOT conditions in neutral did not accelerate and "stalled" @4,000 RPM.
  • Cranking Compression results:
    • #1. 185 psi
    • #2. 190 psi
    • #3. 195 psi
    • #4. 195 psi
  • Above results are too high for this OEM 9.2:1 SCR engine.

  • This little pickup went through two (2) shops trying to get the problem solved.
  • Timing belt and PCM were replaced trying to solve it w/out success.

Watch the following video......... which also busts a classic or old-school cam degreeing procedure MYTH based solely on cranking compression. IOW.... degreeing the cam based on cranking compression does NOT mean it will provide the best engine performance result.  Don't ...no

<a href="http://sbftech.com/vids/mcmp_0.8.swf?fpFileURL=http://351winsor.com/joel/Shop_Cases/B2300_Timing.FLV&amp;fpPreviewImageURL=http://sbftech.com/vids/SBF_log1.JPG&amp;colorScheme=ff0000&amp;cpBackgroundColor=ffff00&amp;cpHidePanel=mouseout&amp;cpHideDelay=.5&amp;fpButtonSize=63x63" target="_blank">http://sbftech.com/vids/mcmp_0.8.swf?fpFileURL=http://351winsor.com/joel/Shop_Cases/B2300_Timing.FLV&amp;fpPreviewImageURL=http://sbftech.com/vids/SBF_log1.JPG&amp;colorScheme=ff0000&amp;cpBackgroundColor=ffff00&amp;cpHidePanel=mouseout&amp;cpHideDelay=.5&amp;fpButtonSize=63x63</a>



'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2

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